Russian blues have BLUE skin !! - used to apply systemic flea liquid as a precaution ,as he would keep loosing collars when out patrolling his territory , finding skin to apply this liquid was very tricky as fur was very dense , the fur also has unusual apparent colour change illusion , appears to be dark grey one minute , then light grey minutes later , dependant on light source , but always beautiful , RIP Smokey ❤️